You have been nominated to take the ALS ice bucket challenge. The bucket contain

Question

You have been nominated to take the ALS ice bucket challenge. The bucket contains 4 litters of Ice water with 75% water and 25% Ice. Calculate the weight of the bucket acting along Fl and force F acting along the forearms to hold the bucket over your head.(Hint: Ice has a lower density than water.) Enter final answer below. Include units and directions (+/- signs and arrows) when appropriate, and round to 3 significant digits, i.e. 100.568 = 101 and 1.001 = 1.00 Fl F F in Cartesian vector notation

Explanation / Answer

4 L = 4.0E-3 m^3

so mass = mice + mwater = 3.0E-3*1000 + 1.0E-3*934= 3.93 kg

F1 = m g = 3.93*9.81= 38.6 N

so sum forces in the y
2 Fy - F1 = 0

2*F*4/5 - F1 = 0

8/5 F = F1

F = 5 F1/8 = 5*38.6/8= 24.1 N

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